Addison's disease is a rare chronic condition where the adrenal glands do not produce enough essential hormones, mainly cortisol and aldosterone1. This hormone deficiency can lead to serious health problems, including life-threatening adrenal crises if untreated2. Although symptoms often develop slowly and can be mistaken for other conditions, early diagnosis and lifelong treatment can help patients live active, healthy lives3.
Addison's Disease Symptoms
Symptoms of Addison's disease are often non-specific, making diagnosis challenging and frequently delayed4. Common early symptoms include weakness, fatigue, and weight loss5. Patients may also experience gastrointestinal complaints such as nausea, vomiting, and diarrhea67. Orthostatic hypotension, which causes dizziness or fainting upon standing, is another frequent symptom57.
A distinctive feature of Addison's disease is hyperpigmentation—darkening of the skin—which can appear as diffuse, non-scaly patches on the face, hands, and palms, and may be more noticeable inside the mouth89. Salt craving is also common due to aldosterone deficiency10. Psychiatric symptoms such as depression, anxiety, social isolation, and poor concentration can occur, often linked to the gradual onset of hormone deficiency11.
Symptoms usually progress slowly, but physical stressors like infections or injuries can worsen the condition rapidly, potentially triggering an adrenal crisis—a medical emergency characterized by severe weakness, low blood pressure, and shock4129.
- Weakness and fatigue54
- Hyperpigmentation, including intraoral pigmentation89
- Weight loss and loss of appetite6
- Gastrointestinal symptoms: nausea, vomiting, diarrhea67
- Orthostatic hypotension (dizziness on standing)57
- Salt craving10
- Psychiatric symptoms: depression, anxiety, poor concentration11
- Symptoms worsen with stress or illness412
Causes of Addison's Disease
Addison's disease, also called primary adrenal insufficiency, results from damage to the adrenal cortex, leading to insufficient production of cortisol and aldosterone13. The most common cause in adults in industrialized countries is autoimmune adrenalitis, where the immune system mistakenly attacks the adrenal glands4145. In children, congenital defects are more frequent causes414.
Other causes include infections such as tuberculosis, metastatic cancers invading the adrenal glands, and acquired immunodeficiency syndrome (AIDS)57. Less common causes are adrenal hemorrhage, infiltrative diseases, and certain medications that inhibit cortisol synthesis57.
Risk Factors
- Autoimmune diseases (e.g., autoimmune thyroiditis, type 1 diabetes) increase risk1516.
- Genetic predisposition to autoimmune polyendocrine syndromes16.
- History of infections like tuberculosis or HIV57.
- Use of medications that suppress adrenal function (e.g., ketoconazole, etomidate)10.
- Adrenal gland trauma or hemorrhage5.
Diagnosing Addison's Disease
Diagnosis of Addison's disease can be difficult due to its slow onset and non-specific symptoms414. Blood tests are essential and typically reveal low cortisol and aldosterone levels, high adrenocorticotropic hormone (ACTH), and elevated renin levels317. Electrolyte imbalances such as hyponatremia (low sodium) and hyperkalemia (high potassium) are common findings317.
The 250 μg ACTH stimulation test is the standard diagnostic tool. It measures cortisol response after administration of synthetic ACTH; a blunted or absent increase confirms adrenal insufficiency18. Early morning cortisol levels can also be informative, with levels above 18 μg/dL generally excluding Addison's disease16.
Additional tests may include:
- Measurement of adrenal autoantibodies to confirm autoimmune etiology16.
- Imaging studies such as computed tomography (CT) of the abdomen to assess adrenal gland size and detect infections, hemorrhage, or tumors3171920.
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Insulin tolerance test or corticotropin-releasing hormone (CRH) test to differentiate primary from secondary adrenal insufficiency when needed20.
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Low cortisol and aldosterone levels317
- Elevated ACTH and renin317
- Electrolyte disturbances: hyponatremia, hyperkalemia317
- Blunted cortisol response to ACTH stimulation test18
- Presence of adrenal autoantibodies in autoimmune cases16
- Imaging to evaluate adrenal gland morphology31719
“Addison disease is a life-threatening condition that requires accurate diagnosis and prompt treatment. A delayed diagnosis carries a high morbidity and mortality.”
— Sadaf Munir et al., StatPearls16
Addison's Disease Treatment Options
Treatment for Addison's disease involves lifelong hormone replacement therapy to substitute deficient cortisol and aldosterone31719. Hydrocortisone or other corticosteroids such as prednisolone are administered two to three times daily to mimic the natural circadian rhythm of cortisol secretion31719. Fludrocortisone is prescribed to replace aldosterone and maintain sodium and potassium balance31719.
Dosages often need adjustment during periods of physical stress, such as illness, surgery, or injury, to prevent adrenal crisis31719. In cases of adrenal crisis, immediate intravenous administration of high-dose hydrocortisone, fluids, and electrolyte replacement is critical31719.
Monitoring treatment includes regular assessment of symptoms, electrolytes, and blood pressure to avoid under- or overtreatment. Overreplacement with glucocorticoids may lead to complications such as obesity, diabetes, and osteoporosis15.
- Hydrocortisone or prednisolone for cortisol replacement31719
- Fludrocortisone for aldosterone replacement31719
- Dose adjustments during stress or illness31719
- Emergency IV hydrocortisone and fluids for adrenal crisis31719
- Regular monitoring to prevent complications15
| Medication | Purpose | Typical Dose Range | Notes |
|---|---|---|---|
| Hydrocortisone | Cortisol replacement | 10–25 mg/day, divided doses | Mimics natural circadian rhythm21 |
| Prednisolone | Alternative glucocorticoid | Variable | Taken 2–3 times daily3 |
| Fludrocortisone | Aldosterone replacement | 0.05–0.2 mg/day | Adjust sodium intake accordingly3 |
Preventing Addison's Disease
Currently, there is no evidence-based method to prevent Addison's disease, as it is primarily an autoimmune disorder22. Early recognition and treatment of symptoms are crucial to prevent serious complications such as adrenal crisis317.
Patients with Addison's disease require lifelong follow-up and surveillance to manage their condition effectively317. Preventive strategies focus on education about stress dosing of steroids and recognizing early signs of adrenal crisis31719.
- Take prescribed hormone replacement medications exactly as directed31719
- Learn to adjust steroid doses during illness or stress31719
- Carry emergency hydrocortisone injection kits and medical alert identification31719
- Maintain regular healthcare visits for monitoring31719
Related Health Conditions
Addison's disease is often associated with other autoimmune disorders, such as autoimmune thyroid disease, type 1 diabetes, pernicious anemia, vitiligo, and alopecia1516. Patients with Addison's disease have a significant risk of developing additional autoimmune conditions15.
Improper hormone replacement therapy can lead to complications. Excess glucocorticoids may cause obesity, diabetes, and osteoporosis, while inadequate treatment increases the risk of adrenal crisis15. Careful management by healthcare providers is essential to balance hormone levels and prevent these complications15.
Living With Addison's Disease
“Sometimes we fall into things, and it goes a long way back to college. I was always interested in stress and stress hormones, probably trying to understand myself as a youth! This led to medical school, endocrinology, studying various aspects of the hypothalamic–pituitary–adrenal axis and ultimately now to my job at Michigan where I serve as the Millie Schembechler Professorship in Adrenal Cancer.”
— Gary Hammer, University of Michigan23
With proper treatment, patients with Addison's disease can resume normal daily activities and maintain a high functional status317. However, living with Addison's requires lifelong medication adherence, regular medical follow-up, and awareness of potential complications31719.
Patients should carry medical alert identification and have an emergency plan, including access to injectable hydrocortisone, to manage adrenal crises effectively31719. Dietary adjustments, such as increased salt intake during hot weather or illness, may be recommended31719. Calcium and vitamin D supplementation might be necessary to prevent osteoporosis related to corticosteroid use31719.
- Take medications consistently and as prescribed31719
- Wear a medical alert bracelet or carry an ID card31719
- Learn to recognize early signs of adrenal crisis31719
- Adjust medication doses during illness or stress with healthcare guidance31719
- Maintain a balanced diet with adequate salt, calcium, and vitamin D31719
